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00024 #include "polarssl/config.h"
00025
00026 #if defined(POLARSSL_SSL_SRV_C)
00027
00028 #include "polarssl/debug.h"
00029 #include "polarssl/ssl.h"
00030
00031 #include <string.h>
00032 #include <stdlib.h>
00033 #include <stdio.h>
00034 #include <time.h>
00035
00036 static int ssl_parse_client_hello( ssl_context *ssl )
00037 {
00038 int ret, i, j, n;
00039 int ciph_len, sess_len;
00040 int chal_len, comp_len;
00041 unsigned char *buf, *p;
00042
00043 SSL_DEBUG_MSG( 2, ( "=> parse client hello" ) );
00044
00045 if( ( ret = ssl_fetch_input( ssl, 5 ) ) != 0 )
00046 {
00047 SSL_DEBUG_RET( 1, "ssl_fetch_input", ret );
00048 return( ret );
00049 }
00050
00051 buf = ssl->in_hdr;
00052
00053 if( ( buf[0] & 0x80 ) != 0 )
00054 {
00055 SSL_DEBUG_BUF( 4, "record header", buf, 5 );
00056
00057 SSL_DEBUG_MSG( 3, ( "client hello v2, message type: %d",
00058 buf[2] ) );
00059 SSL_DEBUG_MSG( 3, ( "client hello v2, message len.: %d",
00060 ( ( buf[0] & 0x7F ) << 8 ) | buf[1] ) );
00061 SSL_DEBUG_MSG( 3, ( "client hello v2, max. version: [%d:%d]",
00062 buf[3], buf[4] ) );
00063
00064
00065
00066
00067
00068
00069
00070
00071
00072
00073
00074 if( buf[2] != SSL_HS_CLIENT_HELLO ||
00075 buf[3] != SSL_MAJOR_VERSION_3 )
00076 {
00077 SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
00078 return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
00079 }
00080
00081 n = ( ( buf[0] << 8 ) | buf[1] ) & 0x7FFF;
00082
00083 if( n < 17 || n > 512 )
00084 {
00085 SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
00086 return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
00087 }
00088
00089 ssl->max_major_ver = buf[3];
00090 ssl->max_minor_ver = buf[4];
00091
00092 ssl->major_ver = SSL_MAJOR_VERSION_3;
00093 ssl->minor_ver = ( buf[4] <= SSL_MINOR_VERSION_1 )
00094 ? buf[4] : SSL_MINOR_VERSION_1;
00095
00096 if( ( ret = ssl_fetch_input( ssl, 2 + n ) ) != 0 )
00097 {
00098 SSL_DEBUG_RET( 1, "ssl_fetch_input", ret );
00099 return( ret );
00100 }
00101
00102 md5_update( &ssl->fin_md5 , buf + 2, n );
00103 sha1_update( &ssl->fin_sha1, buf + 2, n );
00104
00105 buf = ssl->in_msg;
00106 n = ssl->in_left - 5;
00107
00108
00109
00110
00111
00112
00113
00114
00115
00116 SSL_DEBUG_BUF( 4, "record contents", buf, n );
00117
00118 ciph_len = ( buf[0] << 8 ) | buf[1];
00119 sess_len = ( buf[2] << 8 ) | buf[3];
00120 chal_len = ( buf[4] << 8 ) | buf[5];
00121
00122 SSL_DEBUG_MSG( 3, ( "ciph_len: %d, sess_len: %d, chal_len: %d",
00123 ciph_len, sess_len, chal_len ) );
00124
00125
00126
00127
00128 if( ciph_len < 3 || ( ciph_len % 3 ) != 0 )
00129 {
00130 SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
00131 return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
00132 }
00133
00134 if( sess_len < 0 || sess_len > 32 )
00135 {
00136 SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
00137 return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
00138 }
00139
00140 if( chal_len < 8 || chal_len > 32 )
00141 {
00142 SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
00143 return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
00144 }
00145
00146 if( n != 6 + ciph_len + sess_len + chal_len )
00147 {
00148 SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
00149 return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
00150 }
00151
00152 SSL_DEBUG_BUF( 3, "client hello, cipherlist",
00153 buf + 6, ciph_len );
00154 SSL_DEBUG_BUF( 3, "client hello, session id",
00155 buf + 6 + ciph_len, sess_len );
00156 SSL_DEBUG_BUF( 3, "client hello, challenge",
00157 buf + 6 + ciph_len + sess_len, chal_len );
00158
00159 p = buf + 6 + ciph_len;
00160 ssl->session->length = sess_len;
00161 memset( ssl->session->id, 0, sizeof( ssl->session->id ) );
00162 memcpy( ssl->session->id, p, ssl->session->length );
00163
00164 p += sess_len;
00165 memset( ssl->randbytes, 0, 64 );
00166 memcpy( ssl->randbytes + 32 - chal_len, p, chal_len );
00167
00168 for( i = 0; ssl->ciphers[i] != 0; i++ )
00169 {
00170 for( j = 0, p = buf + 6; j < ciph_len; j += 3, p += 3 )
00171 {
00172 if( p[0] == 0 &&
00173 p[1] == 0 &&
00174 p[2] == ssl->ciphers[i] )
00175 goto have_cipher;
00176 }
00177 }
00178 }
00179 else
00180 {
00181 SSL_DEBUG_BUF( 4, "record header", buf, 5 );
00182
00183 SSL_DEBUG_MSG( 3, ( "client hello v3, message type: %d",
00184 buf[0] ) );
00185 SSL_DEBUG_MSG( 3, ( "client hello v3, message len.: %d",
00186 ( buf[3] << 8 ) | buf[4] ) );
00187 SSL_DEBUG_MSG( 3, ( "client hello v3, protocol ver: [%d:%d]",
00188 buf[1], buf[2] ) );
00189
00190
00191
00192
00193
00194
00195
00196
00197
00198 if( buf[0] != SSL_MSG_HANDSHAKE ||
00199 buf[1] != SSL_MAJOR_VERSION_3 )
00200 {
00201 SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
00202 return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
00203 }
00204
00205 n = ( buf[3] << 8 ) | buf[4];
00206
00207 if( n < 45 || n > 512 )
00208 {
00209 SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
00210 return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
00211 }
00212
00213 if( ( ret = ssl_fetch_input( ssl, 5 + n ) ) != 0 )
00214 {
00215 SSL_DEBUG_RET( 1, "ssl_fetch_input", ret );
00216 return( ret );
00217 }
00218
00219 buf = ssl->in_msg;
00220 n = ssl->in_left - 5;
00221
00222 md5_update( &ssl->fin_md5 , buf, n );
00223 sha1_update( &ssl->fin_sha1, buf, n );
00224
00225
00226
00227
00228
00229
00230
00231
00232
00233
00234
00235
00236
00237
00238
00239 SSL_DEBUG_BUF( 4, "record contents", buf, n );
00240
00241 SSL_DEBUG_MSG( 3, ( "client hello v3, handshake type: %d",
00242 buf[0] ) );
00243 SSL_DEBUG_MSG( 3, ( "client hello v3, handshake len.: %d",
00244 ( buf[1] << 16 ) | ( buf[2] << 8 ) | buf[3] ) );
00245 SSL_DEBUG_MSG( 3, ( "client hello v3, max. version: [%d:%d]",
00246 buf[4], buf[5] ) );
00247
00248
00249
00250
00251 if( buf[0] != SSL_HS_CLIENT_HELLO ||
00252 buf[4] != SSL_MAJOR_VERSION_3 )
00253 {
00254 SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
00255 return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
00256 }
00257
00258 ssl->major_ver = SSL_MAJOR_VERSION_3;
00259 ssl->minor_ver = ( buf[5] <= SSL_MINOR_VERSION_1 )
00260 ? buf[5] : SSL_MINOR_VERSION_1;
00261
00262 ssl->max_major_ver = buf[4];
00263 ssl->max_minor_ver = buf[5];
00264
00265 memcpy( ssl->randbytes, buf + 6, 32 );
00266
00267
00268
00269
00270 if( buf[1] != 0 || n != 4 + ( ( buf[2] << 8 ) | buf[3] ) )
00271 {
00272 SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
00273 return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
00274 }
00275
00276
00277
00278
00279 sess_len = buf[38];
00280
00281 if( sess_len < 0 || sess_len > 32 )
00282 {
00283 SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
00284 return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
00285 }
00286
00287 ssl->session->length = sess_len;
00288 memset( ssl->session->id, 0, sizeof( ssl->session->id ) );
00289 memcpy( ssl->session->id, buf + 39 , ssl->session->length );
00290
00291
00292
00293
00294 ciph_len = ( buf[39 + sess_len] << 8 )
00295 | ( buf[40 + sess_len] );
00296
00297 if( ciph_len < 2 || ciph_len > 256 || ( ciph_len % 2 ) != 0 )
00298 {
00299 SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
00300 return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
00301 }
00302
00303
00304
00305
00306 comp_len = buf[41 + sess_len + ciph_len];
00307
00308 if( comp_len < 1 || comp_len > 16 )
00309 {
00310 SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
00311 return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO );
00312 }
00313
00314 SSL_DEBUG_BUF( 3, "client hello, random bytes",
00315 buf + 6, 32 );
00316 SSL_DEBUG_BUF( 3, "client hello, session id",
00317 buf + 38, sess_len );
00318 SSL_DEBUG_BUF( 3, "client hello, cipherlist",
00319 buf + 41 + sess_len, ciph_len );
00320 SSL_DEBUG_BUF( 3, "client hello, compression",
00321 buf + 42 + sess_len + ciph_len, comp_len );
00322
00323
00324
00325
00326 for( i = 0; ssl->ciphers[i] != 0; i++ )
00327 {
00328 for( j = 0, p = buf + 41 + sess_len; j < ciph_len;
00329 j += 2, p += 2 )
00330 {
00331 if( p[0] == 0 && p[1] == ssl->ciphers[i] )
00332 goto have_cipher;
00333 }
00334 }
00335 }
00336
00337 SSL_DEBUG_MSG( 1, ( "got no ciphers in common" ) );
00338
00339 return( POLARSSL_ERR_SSL_NO_CIPHER_CHOSEN );
00340
00341 have_cipher:
00342
00343 ssl->session->cipher = ssl->ciphers[i];
00344 ssl->in_left = 0;
00345 ssl->state++;
00346
00347 SSL_DEBUG_MSG( 2, ( "<= parse client hello" ) );
00348
00349 return( 0 );
00350 }
00351
00352 static int ssl_write_server_hello( ssl_context *ssl )
00353 {
00354 time_t t;
00355 int ret, i, n;
00356 unsigned char *buf, *p;
00357
00358 SSL_DEBUG_MSG( 2, ( "=> write server hello" ) );
00359
00360
00361
00362
00363
00364
00365
00366
00367 buf = ssl->out_msg;
00368 p = buf + 4;
00369
00370 *p++ = (unsigned char) ssl->major_ver;
00371 *p++ = (unsigned char) ssl->minor_ver;
00372
00373 SSL_DEBUG_MSG( 3, ( "server hello, chosen version: [%d:%d]",
00374 buf[4], buf[5] ) );
00375
00376 t = time( NULL );
00377 *p++ = (unsigned char)( t >> 24 );
00378 *p++ = (unsigned char)( t >> 16 );
00379 *p++ = (unsigned char)( t >> 8 );
00380 *p++ = (unsigned char)( t );
00381
00382 SSL_DEBUG_MSG( 3, ( "server hello, current time: %lu", t ) );
00383
00384 for( i = 28; i > 0; i-- )
00385 *p++ = (unsigned char) ssl->f_rng( ssl->p_rng );
00386
00387 memcpy( ssl->randbytes + 32, buf + 6, 32 );
00388
00389 SSL_DEBUG_BUF( 3, "server hello, random bytes", buf + 6, 32 );
00390
00391
00392
00393
00394
00395
00396
00397 ssl->session->length = n = 32;
00398 *p++ = (unsigned char) ssl->session->length;
00399
00400 if( ssl->s_get == NULL ||
00401 ssl->s_get( ssl ) != 0 )
00402 {
00403
00404
00405
00406 ssl->resume = 0;
00407 ssl->state++;
00408
00409 for( i = 0; i < n; i++ )
00410 ssl->session->id[i] =
00411 (unsigned char) ssl->f_rng( ssl->p_rng );
00412 }
00413 else
00414 {
00415
00416
00417
00418 ssl->resume = 1;
00419 ssl->state = SSL_SERVER_CHANGE_CIPHER_SPEC;
00420 ssl_derive_keys( ssl );
00421 }
00422
00423 memcpy( p, ssl->session->id, ssl->session->length );
00424 p += ssl->session->length;
00425
00426 SSL_DEBUG_MSG( 3, ( "server hello, session id len.: %d", n ) );
00427 SSL_DEBUG_BUF( 3, "server hello, session id", buf + 39, n );
00428 SSL_DEBUG_MSG( 3, ( "%s session has been resumed",
00429 ssl->resume ? "a" : "no" ) );
00430
00431 *p++ = (unsigned char)( ssl->session->cipher >> 8 );
00432 *p++ = (unsigned char)( ssl->session->cipher );
00433 *p++ = SSL_COMPRESS_NULL;
00434
00435 SSL_DEBUG_MSG( 3, ( "server hello, chosen cipher: %d",
00436 ssl->session->cipher ) );
00437 SSL_DEBUG_MSG( 3, ( "server hello, compress alg.: %d", 0 ) );
00438
00439 ssl->out_msglen = p - buf;
00440 ssl->out_msgtype = SSL_MSG_HANDSHAKE;
00441 ssl->out_msg[0] = SSL_HS_SERVER_HELLO;
00442
00443 ret = ssl_write_record( ssl );
00444
00445 SSL_DEBUG_MSG( 2, ( "<= write server hello" ) );
00446
00447 return( ret );
00448 }
00449
00450 static int ssl_write_certificate_request( ssl_context *ssl )
00451 {
00452 int ret, n;
00453 unsigned char *buf, *p;
00454 x509_cert *crt;
00455
00456 SSL_DEBUG_MSG( 2, ( "=> write certificate request" ) );
00457
00458 ssl->state++;
00459
00460 if( ssl->authmode == SSL_VERIFY_NONE )
00461 {
00462 SSL_DEBUG_MSG( 2, ( "<= skip write certificate request" ) );
00463 return( 0 );
00464 }
00465
00466
00467
00468
00469
00470
00471
00472
00473
00474
00475
00476 buf = ssl->out_msg;
00477 p = buf + 4;
00478
00479
00480
00481
00482 *p++ = 1;
00483 *p++ = 1;
00484
00485 p += 2;
00486 crt = ssl->ca_chain;
00487
00488 while( crt != NULL && crt->next != NULL )
00489 {
00490 if( p - buf > 4096 )
00491 break;
00492
00493 n = crt->subject_raw.len;
00494 *p++ = (unsigned char)( n >> 8 );
00495 *p++ = (unsigned char)( n );
00496 memcpy( p, crt->subject_raw.p, n );
00497
00498 SSL_DEBUG_BUF( 3, "requested DN", p, n );
00499 p += n; crt = crt->next;
00500 }
00501
00502 ssl->out_msglen = n = p - buf;
00503 ssl->out_msgtype = SSL_MSG_HANDSHAKE;
00504 ssl->out_msg[0] = SSL_HS_CERTIFICATE_REQUEST;
00505 ssl->out_msg[6] = (unsigned char)( ( n - 8 ) >> 8 );
00506 ssl->out_msg[7] = (unsigned char)( ( n - 8 ) );
00507
00508 ret = ssl_write_record( ssl );
00509
00510 SSL_DEBUG_MSG( 2, ( "<= write certificate request" ) );
00511
00512 return( ret );
00513 }
00514
00515 static int ssl_write_server_key_exchange( ssl_context *ssl )
00516 {
00517 int ret, n;
00518 unsigned char hash[36];
00519 md5_context md5;
00520 sha1_context sha1;
00521
00522 SSL_DEBUG_MSG( 2, ( "=> write server key exchange" ) );
00523
00524 if( ssl->session->cipher != SSL_EDH_RSA_DES_168_SHA &&
00525 ssl->session->cipher != SSL_EDH_RSA_AES_256_SHA &&
00526 ssl->session->cipher != SSL_EDH_RSA_CAMELLIA_256_SHA)
00527 {
00528 SSL_DEBUG_MSG( 2, ( "<= skip write server key exchange" ) );
00529 ssl->state++;
00530 return( 0 );
00531 }
00532
00533 #if !defined(POLARSSL_DHM_C)
00534 SSL_DEBUG_MSG( 1, ( "support for dhm is not available" ) );
00535 return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE );
00536 #else
00537
00538
00539
00540
00541
00542
00543
00544
00545
00546 if( ( ret = dhm_make_params( &ssl->dhm_ctx, 256, ssl->out_msg + 4,
00547 &n, ssl->f_rng, ssl->p_rng ) ) != 0 )
00548 {
00549 SSL_DEBUG_RET( 1, "dhm_make_params", ret );
00550 return( ret );
00551 }
00552
00553 SSL_DEBUG_MPI( 3, "DHM: X ", &ssl->dhm_ctx.X );
00554 SSL_DEBUG_MPI( 3, "DHM: P ", &ssl->dhm_ctx.P );
00555 SSL_DEBUG_MPI( 3, "DHM: G ", &ssl->dhm_ctx.G );
00556 SSL_DEBUG_MPI( 3, "DHM: GX", &ssl->dhm_ctx.GX );
00557
00558
00559
00560
00561
00562
00563
00564
00565
00566
00567
00568
00569
00570
00571 md5_starts( &md5 );
00572 md5_update( &md5, ssl->randbytes, 64 );
00573 md5_update( &md5, ssl->out_msg + 4, n );
00574 md5_finish( &md5, hash );
00575
00576 sha1_starts( &sha1 );
00577 sha1_update( &sha1, ssl->randbytes, 64 );
00578 sha1_update( &sha1, ssl->out_msg + 4, n );
00579 sha1_finish( &sha1, hash + 16 );
00580
00581 SSL_DEBUG_BUF( 3, "parameters hash", hash, 36 );
00582
00583 ssl->out_msg[4 + n] = (unsigned char)( ssl->rsa_key->len >> 8 );
00584 ssl->out_msg[5 + n] = (unsigned char)( ssl->rsa_key->len );
00585
00586 ret = rsa_pkcs1_sign( ssl->rsa_key, RSA_PRIVATE,
00587 SIG_RSA_RAW, 36, hash, ssl->out_msg + 6 + n );
00588 if( ret != 0 )
00589 {
00590 SSL_DEBUG_RET( 1, "rsa_pkcs1_sign", ret );
00591 return( ret );
00592 }
00593
00594 SSL_DEBUG_BUF( 3, "my RSA sig", ssl->out_msg + 6 + n,
00595 ssl->rsa_key->len );
00596
00597 ssl->out_msglen = 6 + n + ssl->rsa_key->len;
00598 ssl->out_msgtype = SSL_MSG_HANDSHAKE;
00599 ssl->out_msg[0] = SSL_HS_SERVER_KEY_EXCHANGE;
00600
00601 ssl->state++;
00602
00603 if( ( ret = ssl_write_record( ssl ) ) != 0 )
00604 {
00605 SSL_DEBUG_RET( 1, "ssl_write_record", ret );
00606 return( ret );
00607 }
00608
00609 SSL_DEBUG_MSG( 2, ( "<= write server key exchange" ) );
00610
00611 return( 0 );
00612 #endif
00613 }
00614
00615 static int ssl_write_server_hello_done( ssl_context *ssl )
00616 {
00617 int ret;
00618
00619 SSL_DEBUG_MSG( 2, ( "=> write server hello done" ) );
00620
00621 ssl->out_msglen = 4;
00622 ssl->out_msgtype = SSL_MSG_HANDSHAKE;
00623 ssl->out_msg[0] = SSL_HS_SERVER_HELLO_DONE;
00624
00625 ssl->state++;
00626
00627 if( ( ret = ssl_write_record( ssl ) ) != 0 )
00628 {
00629 SSL_DEBUG_RET( 1, "ssl_write_record", ret );
00630 return( ret );
00631 }
00632
00633 SSL_DEBUG_MSG( 2, ( "<= write server hello done" ) );
00634
00635 return( 0 );
00636 }
00637
00638 static int ssl_parse_client_key_exchange( ssl_context *ssl )
00639 {
00640 int ret, i, n;
00641
00642 SSL_DEBUG_MSG( 2, ( "=> parse client key exchange" ) );
00643
00644 if( ( ret = ssl_read_record( ssl ) ) != 0 )
00645 {
00646 SSL_DEBUG_RET( 1, "ssl_read_record", ret );
00647 return( ret );
00648 }
00649
00650 if( ssl->in_msgtype != SSL_MSG_HANDSHAKE )
00651 {
00652 SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
00653 return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
00654 }
00655
00656 if( ssl->in_msg[0] != SSL_HS_CLIENT_KEY_EXCHANGE )
00657 {
00658 SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
00659 return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
00660 }
00661
00662 if( ssl->session->cipher == SSL_EDH_RSA_DES_168_SHA ||
00663 ssl->session->cipher == SSL_EDH_RSA_AES_256_SHA ||
00664 ssl->session->cipher == SSL_EDH_RSA_CAMELLIA_256_SHA)
00665 {
00666 #if !defined(POLARSSL_DHM_C)
00667 SSL_DEBUG_MSG( 1, ( "support for dhm is not available" ) );
00668 return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE );
00669 #else
00670
00671
00672
00673 n = ( ssl->in_msg[4] << 8 ) | ssl->in_msg[5];
00674
00675 if( n < 1 || n > ssl->dhm_ctx.len ||
00676 n + 6 != ssl->in_hslen )
00677 {
00678 SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
00679 return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
00680 }
00681
00682 if( ( ret = dhm_read_public( &ssl->dhm_ctx,
00683 ssl->in_msg + 6, n ) ) != 0 )
00684 {
00685 SSL_DEBUG_RET( 1, "dhm_read_public", ret );
00686 return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE | ret );
00687 }
00688
00689 SSL_DEBUG_MPI( 3, "DHM: GY", &ssl->dhm_ctx.GY );
00690
00691 ssl->pmslen = ssl->dhm_ctx.len;
00692
00693 if( ( ret = dhm_calc_secret( &ssl->dhm_ctx,
00694 ssl->premaster, &ssl->pmslen ) ) != 0 )
00695 {
00696 SSL_DEBUG_RET( 1, "dhm_calc_secret", ret );
00697 return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE | ret );
00698 }
00699
00700 SSL_DEBUG_MPI( 3, "DHM: K ", &ssl->dhm_ctx.K );
00701 #endif
00702 }
00703 else
00704 {
00705
00706
00707
00708 i = 4;
00709 n = ssl->rsa_key->len;
00710 ssl->pmslen = 48;
00711
00712 if( ssl->minor_ver != SSL_MINOR_VERSION_0 )
00713 {
00714 i += 2;
00715 if( ssl->in_msg[4] != ( ( n >> 8 ) & 0xFF ) ||
00716 ssl->in_msg[5] != ( ( n ) & 0xFF ) )
00717 {
00718 SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
00719 return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
00720 }
00721 }
00722
00723 if( ssl->in_hslen != i + n )
00724 {
00725 SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
00726 return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
00727 }
00728
00729 ret = rsa_pkcs1_decrypt( ssl->rsa_key, RSA_PRIVATE, &ssl->pmslen,
00730 ssl->in_msg + i, ssl->premaster,
00731 sizeof(ssl->premaster) );
00732
00733 if( ret != 0 || ssl->pmslen != 48 ||
00734 ssl->premaster[0] != ssl->max_major_ver ||
00735 ssl->premaster[1] != ssl->max_minor_ver )
00736 {
00737 SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
00738
00739
00740
00741
00742
00743
00744
00745 ssl->pmslen = 48;
00746
00747 for( i = 0; i < ssl->pmslen; i++ )
00748 ssl->premaster[i] = (unsigned char) ssl->f_rng( ssl->p_rng );
00749 }
00750 }
00751
00752 ssl_derive_keys( ssl );
00753
00754 if( ssl->s_set != NULL )
00755 ssl->s_set( ssl );
00756
00757 ssl->state++;
00758
00759 SSL_DEBUG_MSG( 2, ( "<= parse client key exchange" ) );
00760
00761 return( 0 );
00762 }
00763
00764 static int ssl_parse_certificate_verify( ssl_context *ssl )
00765 {
00766 int n1, n2, ret;
00767 unsigned char hash[36];
00768
00769 SSL_DEBUG_MSG( 2, ( "=> parse certificate verify" ) );
00770
00771 if( ssl->peer_cert == NULL )
00772 {
00773 SSL_DEBUG_MSG( 2, ( "<= skip parse certificate verify" ) );
00774 ssl->state++;
00775 return( 0 );
00776 }
00777
00778 ssl_calc_verify( ssl, hash );
00779
00780 if( ( ret = ssl_read_record( ssl ) ) != 0 )
00781 {
00782 SSL_DEBUG_RET( 1, "ssl_read_record", ret );
00783 return( ret );
00784 }
00785
00786 ssl->state++;
00787
00788 if( ssl->in_msgtype != SSL_MSG_HANDSHAKE )
00789 {
00790 SSL_DEBUG_MSG( 1, ( "bad certificate verify message" ) );
00791 return( POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY );
00792 }
00793
00794 if( ssl->in_msg[0] != SSL_HS_CERTIFICATE_VERIFY )
00795 {
00796 SSL_DEBUG_MSG( 1, ( "bad certificate verify message" ) );
00797 return( POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY );
00798 }
00799
00800 n1 = ssl->peer_cert->rsa.len;
00801 n2 = ( ssl->in_msg[4] << 8 ) | ssl->in_msg[5];
00802
00803 if( n1 + 6 != ssl->in_hslen || n1 != n2 )
00804 {
00805 SSL_DEBUG_MSG( 1, ( "bad certificate verify message" ) );
00806 return( POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY );
00807 }
00808
00809 ret = rsa_pkcs1_verify( &ssl->peer_cert->rsa, RSA_PUBLIC,
00810 SIG_RSA_RAW, 36, hash, ssl->in_msg + 6 );
00811 if( ret != 0 )
00812 {
00813 SSL_DEBUG_RET( 1, "rsa_pkcs1_verify", ret );
00814 return( ret );
00815 }
00816
00817 SSL_DEBUG_MSG( 2, ( "<= parse certificate verify" ) );
00818
00819 return( 0 );
00820 }
00821
00822
00823
00824
00825 int ssl_handshake_server( ssl_context *ssl )
00826 {
00827 int ret = 0;
00828
00829 SSL_DEBUG_MSG( 2, ( "=> handshake server" ) );
00830
00831 while( ssl->state != SSL_HANDSHAKE_OVER )
00832 {
00833 SSL_DEBUG_MSG( 2, ( "server state: %d", ssl->state ) );
00834
00835 if( ( ret = ssl_flush_output( ssl ) ) != 0 )
00836 break;
00837
00838 switch( ssl->state )
00839 {
00840 case SSL_HELLO_REQUEST:
00841 ssl->state = SSL_CLIENT_HELLO;
00842 break;
00843
00844
00845
00846
00847 case SSL_CLIENT_HELLO:
00848 ret = ssl_parse_client_hello( ssl );
00849 break;
00850
00851
00852
00853
00854
00855
00856
00857
00858 case SSL_SERVER_HELLO:
00859 ret = ssl_write_server_hello( ssl );
00860 break;
00861
00862 case SSL_SERVER_CERTIFICATE:
00863 ret = ssl_write_certificate( ssl );
00864 break;
00865
00866 case SSL_SERVER_KEY_EXCHANGE:
00867 ret = ssl_write_server_key_exchange( ssl );
00868 break;
00869
00870 case SSL_CERTIFICATE_REQUEST:
00871 ret = ssl_write_certificate_request( ssl );
00872 break;
00873
00874 case SSL_SERVER_HELLO_DONE:
00875 ret = ssl_write_server_hello_done( ssl );
00876 break;
00877
00878
00879
00880
00881
00882
00883
00884
00885 case SSL_CLIENT_CERTIFICATE:
00886 ret = ssl_parse_certificate( ssl );
00887 break;
00888
00889 case SSL_CLIENT_KEY_EXCHANGE:
00890 ret = ssl_parse_client_key_exchange( ssl );
00891 break;
00892
00893 case SSL_CERTIFICATE_VERIFY:
00894 ret = ssl_parse_certificate_verify( ssl );
00895 break;
00896
00897 case SSL_CLIENT_CHANGE_CIPHER_SPEC:
00898 ret = ssl_parse_change_cipher_spec( ssl );
00899 break;
00900
00901 case SSL_CLIENT_FINISHED:
00902 ret = ssl_parse_finished( ssl );
00903 break;
00904
00905
00906
00907
00908
00909 case SSL_SERVER_CHANGE_CIPHER_SPEC:
00910 ret = ssl_write_change_cipher_spec( ssl );
00911 break;
00912
00913 case SSL_SERVER_FINISHED:
00914 ret = ssl_write_finished( ssl );
00915 break;
00916
00917 case SSL_FLUSH_BUFFERS:
00918 SSL_DEBUG_MSG( 2, ( "handshake: done" ) );
00919 ssl->state = SSL_HANDSHAKE_OVER;
00920 break;
00921
00922 default:
00923 SSL_DEBUG_MSG( 1, ( "invalid state %d", ssl->state ) );
00924 return( POLARSSL_ERR_SSL_BAD_INPUT_DATA );
00925 }
00926
00927 if( ret != 0 )
00928 break;
00929 }
00930
00931 SSL_DEBUG_MSG( 2, ( "<= handshake server" ) );
00932
00933 return( ret );
00934 }
00935
00936 #endif